Throw-off mechanism for cutters and creasers



- FebQB, 1931. c. FRAUENBERGER 1,791,163

THROW-OFF MECHANISM FOR CUTTERS AND CREASERS Filed June 2'7,v 1929 2 Sheets- Sheet 1 g avwemtoz I Feb. 3, 1931. c. F. FRAUENBERGER THROW-OFF MECHANISM FOR CUTTERS AND CHEASERS Filed June 27. 1929 2 Shets-Sheet 2 ATTORNEY Patented Feb. 3, 193] UNETEB STATES PATENT OFFICE CARL F. FRA'UENBERGER, OF CLINTON CORNER-S, NEW YORK, ASSIGNOB- TO THOMSON NATIONAL PRESS CO. INC., A CORPORATION OF DELAWARE THROW-OFF MECHANISM FOR CUTTER-S AND CRELASERS Application filed June 27,

The object of my invention is to provide an improved throw off ortripping mechanism for cutters, creasers and like machines which comprise a stationary form member and a rocking or oscillating platen. The latter is carried on a shaft which is moved eccentrically in order to adjust the impression. The platen therefore is capable of being moved into one of several different positions.

Consequently it is necessary that the throw off mechanism be arranged so as to be able to function irrespective of the position of the platen.

Heretofore the tripping mechanism has been arranged in a manner to permit it to be set or adjusted to correspond with the position of the platen. It is one of the objects of my invention to provide a tripping mechanism which need not be set or adjusted for any particular platen position. Another object of the invention is to provide a simplified efficient throw 01f mechanism having but comparatively few parts.

My invention is embodied in a throw ofi mechanism as hereinafter described and as illustrated in the accompanying drawings in which 1 is a side view of a cutter and creasing press equipped with a throw off mechanism embodying my invention, with parts removed and broken away.

Fig. 1A is a detailed vlew of a part of Figure 1.

Fig. 2 is a front view looking in the direction of arrow 2 in Figure 1 and with parts removed and broken away.

Fig. 3 is a sectional detail view of parts of the impression adjusting mechanism.

Fig. 4. is a plan view of the adjusting pawl. Fig. 5 is a sectional detail view of parts shown in Figure 3.

Fig. 6 is a wiring diagram.

. Fig. 7 is a detail view of the platen locking latch.

Referring to the drawingsjthe reference numeral 1 denotes the frame of the press. 2 is the stationary form member and 3 is the en which rocks or oscillates on the frame T U connecting rods 4.

being operated in a well known manner by 1929. Serial No. 373,998.

The platen is carried on a shaft 5 journaled in eccentric sleeves 6 mounted in the ends of the connecting rods. Each sleeve is provided with a radially disposed arm 7 and the two arms are connected across the machine by an adjuster bar 8. Only one side of the press is shown. The platen has side frames 9-forming rockers 10 which rock or roll on tracks 11 on the press frame. The impressionof the platen on the form, which is not shown, is regulated by rotating or adjusting the eccentric sleeves 6 in the connecting rods whereby to move the shaft 5 closer to or further away from the form in a well known manner.

For this purpose the platen body is at each side provided with a number of teeth 12. 13 is a pawl which hasa tooth 14 adapted to engage between the teeth 12. On top the pawl is provided with a notch-15. The front or outer portion of the notch 15 is higher as at 16 than the rear portion 17 The pawl is held in adjusted position by two flat headed screws 18, 18 carrying nuts 19, 19 which slide in an undercut groove 20 in the platen body, see Figures 3, 1 and 5.

The adjuster bar 8 carries two latches 21 one at each end within a suitable bearing 22. Each latch has a tooth'23 adapted to engage the aforesaid notch 15 under pressure by a spring 24, whereby the adjuster bar and the eccentric sleeves are locked in a predetermined position with respect to the platen body. The position varies of course in accordance with the position of the tooth 14 in the teeth 12. The latches are lifted away from the notches 15 by means of latch lifting fingers 25 carried by a trip rock shaft 26. The latches re-engage the notches automatically under pressure of the springs 24.

The trip rock shaft 26 is supported in bearings secured to the adjuster bar 8. The one bearing 27, on the one side of the press as shown in Figure 1 is a large bearing bracket. On the other side of the press the bearing 28 is merely large enough to support that end of the shaft. The mechanism for actuating the shaft 26 is mounted on the bearing bracket 27 as follows.

To the shaft 26 there is clamped an arm 30. To the latter is pivoted at 31 a link 32, the lower end of which is pivoted at 33 to a throw on lever 34 pivoted at- 35 on the bracket 27. The lever 34 carries a roller 36 and the bracket 27 carries another roller 38. 39 is a stop. To the outer end of the arm 30 there is pivoted at 40 a link 41, the other end of which is pivoted at 42 to a trip arm 43 pivoted on the platen at 44 and formed with a saddle 45.

The press is tripped by causing the parts 43, 41 and 30 to operate the trip shaft 26 clockwise so as to lift the latches away from the notches 15. When this occurs, the arms 7 fall outward by ravity together with the parts carried there y and the shaft 5-is accordingly rotated to move the platen outward away from the form so as to prevent impression and the press is tripped.

The press is untripped by causing the parts 34, 32 and 30 to operate the trip shaft 26 anticlockwise to permit the springs 24 to force the latches into the notches 15 whereby the arms 7 again become locked in nor- *3' mal position and the shaft 5 moved closer to the form to put on the impression.

The first operation is caused as follows;

A trip lever is pivoted to the form memher at 51 and is normally in the path of the trip arm 43 but it is adapted to be operated by a magnet 87 out of the path of the trip arm 43.

Therefore, as the press is about to close and the platen is on its upward closing stroke, the saddle 45 hits the lever 50. Consequently the arm 43 and link 41 cannot move upward any further, but will be stopped and thereby force the arm 30 downward to rotate the trip shaft 26 clockwise. Therefore the latches will be withdrawn from the notches 15 and the press will be tripped.

At this time it will be noticed that while the platen completes its closing stroke, the pivot 44 moves a little further to the left in Figure 1, but this short movement is compensated for in the straightening out of the two members 43 and 41, when 43 hits 50. Again, when the arm 30 is moved downward as explained, there will of course be short movements by the link 32 and lever 34, but

these are idle movements. Attention is called to these movements to show that the parts or movements referred to do not oppose the tripping of the press.

The press may now be run in tripped condition until the matter causing this abnormal condition has been attended to. While the press runs untripped the latches are kept against the surface of the platen beyond the teeth 12 by the pressure of the spring 24. Thereafter the press is untripped or brought back to normal. This is accomplished as follows.

To the frame of the press there is secured a bracket to which ispivoted at 61 ly not in the path of the rollers 36 and 38' as the platen swingsout-ward. However, when the press is to be untripped, the operator steps on the bar 64 thereby moving the cam 63 to the left in Figure 2.

Consequently, when the platen swings outward, the roller 36 will run on the cam 63, see Fig. 1. The lever 34 will be swung anticlockwise against the sl op 39, the link 32 will be pulled down, hence the arm 30 and shaft 26 will be rotated clockwise and the latches will be pulled outward or lifted to permit the pawl 13 to pass downward past the latches.

By this time tne roller 36 will have run off the cam 63 and the roller 38 will run on this cam. Therefore, bearing bracket 27 and arms 7 will be stopped in their outward and downward movement, and this of course causesthe eccentric sleeves to be rotated back into normal or impression position. lVhen now the platen returns and moves upwards,

the springs 24 will cause the latches to snap into engagement with the notches and lock the adjuster bar 8 in untripped or normal position.

When the operator takes his foot off the bar 64, the abutment swings automatically into its normal vertical position.

The operations may be summarized as follows: Normally the eccentric sleeves 6 are prevented from rotating because their 'arm 7 with the parts thereon are locked to the platen by the latches 21. Consequently the platen shaft 5 can rotate only on its own axis.

The shaft 5 is moved bodily in the platen y by arresting the upstroke of the arms 7 and the eccentric sleeves 6 thus rotating the latter with respect to the platen to move the shaft 5 bodily outward away from the form. Now the platen is tripped.

On the downstroke of the tripped platen, the latches are first pulled outward to permit the pawl 13 to pass by, and this is effected by the roller 36 hitting the cam 63. Next, the

downward movement of the bearing bracket 27 is arrested by its roller 38 running on the cam 63. Consequently the arms 7 and eccentric sleeves 6 are turned backward into normal position. When now the platen returns and the notches 15 come in line with the latches these two elements engage and the press is again untripped.

My invention includes means for starting the press and immediately tripping the platen because it is very undesirable to start lib the press with the impression on. The machine is very heavy and if the impression is on and the heavy platen is swung up against the form, the press is apt to become locked with the connecting rod-s on dead center, 'rhe belt flies ofi the pulley and other troubles occur. Means are also provided for automatically tripping the press when the delivery mechanism fails to remove a sheet after an impression.

During the normal operation of the press, the impression is of course on. The paper, after being cut and creased, is removed by suitable nipper-s which are mounted on swinging arms 71 carried by a shaft 72. As the press closes, the nippers descend and grip the upper edge of the sheet. When the press opens, the nippers are raised and carry the sheet away.

If the sheet is faulty, the nippers cannot seize it and the press must therefore be tripped before it closes. The nippers are therefore included in an electrical operating circuit so arrangcdthat when the nippers close upon each other without a sheet between them, the press will be automaticah iy tripped.

Referring now to Figure 6, it will be seen that there is provided a starting circuit from the line 75 through wires 76, 77 and 78 to a switch magnet 79, thence through wire 80 to the other line 81. This circuit is broken at the starting push button switch 82. When the latter is pushed in, the starting circuit is closed and the magnet 79 operates switch arm 88 to close the operating motor circuit from line 75, through wire 84, switch arm 88 and through the motor to line 81. At the same time another circuit is closed through the magnet 79 as follows. Line 7 5, wire 84, switch arm 83, wire 86 to wire 77, to wire 78, through magnet 79, to wire 80 to line 81. Thus, even though the pressure is taken off the starting button 82 and the starting circuit opened, the magnet 79 will remain energized and the operating circuit through the motor remains closed.

The press commences then to operate and is usually turned over a couple of times, the impresion being off, because there is no current in the impression release magnet 87, one side through wire 88, being open at 82. The operator then puts his foot on the bar 64 to swing the abutment 62 into position to put the impression on and also releases the starting button 82. The release of the starting button switch closes the release circuit through release magnet 87 as follows. From time 75 through wires 84, 86, 77 and 88 to 87, and to the other side through wire 80 to line 81. The release magnet thus becomes energized and keeps the arm 50 in inactive position. The paper may now be fed to the press and the normal operation is on.

The automatic tripping of the press is done as follows.

The operator pushes another tripping push button switch 89 and closes a circuit as follows. From line 75 through wires 8 and'86 to push button 89, to magnet 90 through wire 91 to line 81. The magnet 90 then pulls up its core and closes two switches 92 and 93. Current then passes through the magnet from wire 86 through switch 92 and back through 91 to line 81. Consequently the magnet 90 remains energized even though the trip push button switch 89 is released.

At the same time, however, a stop circuit has been closed through the nippers 7 0 from a local battery 94 through the nippers, wire 95 to a switch 96, through switch 93, wire 97 to stop magnet 98 and back through wire 99 to the battery, provided there is no paper be tween the nippers. In this event, the magnet 98 being energized, it will open the operating circuit in line 78 and the motorwill stop. If there is paper between the nippers, the automatic stop circuit through magnet 98 will be open and the operating circuit through magnet 79 remains closed and the press will continue to operate.

The switch 96 is arranged to momentarily open the stop circuit through the nippers when the latter are in the position shown in Figure 1 ready to grip the paper. At this time it is not desirable that the n1ppers are in a live circuit. The rocking shaft 72 which carries the nipper arms 71 also carries a swinging cam member 100 adapted to engage the switch 96. As the nippers descend to take the paper, the cam 100 opens the switch 96 and keeps it open until the nippers have ascended clear oii the press. If now the nippers have seized a sheet, the circuit through stop magnet 98 will remain open. If the nippers do not seize a sheet, this circuit will be closed and the magnet 98 will open the operating circuit of the press.

The press may be stopped at any time by pressi g the stop button switch 101 to break the operating circuit. The three buttons 82, 89 and 101 may be located conveniently within reach such as indicated in Figure 1.

The press started by pressing starting button 82 which closes the motor operating circuit through magnet 79. At this time the impression is oif. The press is then turned over a couple of times. The starting button is then released and the press untripped by the operator stepping on the foot bar. The release of the starting button automatically closes the automatic tripping circuit through the reiease magnet 87 which keeps the arm 50 out of the path of the arm 4L3.

If the nippers fail to seize a sheet, the stop circuit through magnet 79 is opened and the release magnet 87 lets go of the arm 50 to trip the press.

The throw off mechanism as herein 'described is very simple in construction and operation. It eliminates the necessity for adjustment to correspond with the adjusted position of the platen. The entire stroke of the tripping and untripping means is large enough to cover the range or" platen adjustments.

I claim:

1. In a platen press the combination of mechanism for locking the platen in a predetermined position, means on said platen for unlocking said mechanism to throw oil the impression of the platen and a trip lever pivoted on the frame and wholly disconnected from said unlocking means for operating the latter on the closing stroke of the platen.

2. In a platen press the combination of mechanism for locking the platen in a predetermined position, means on said platen for unlocking said mechanism to throw off the impression of the platen, a trip lever pivoted on the frame and wholly disconnected from said unlocking means for operating the latter on the closing stroke of the platen and devices mounted on the platen 'lor again throwing on the platen impression at the end of the opening stroke of the platen and a swingable abutment for actuating said devices.

3. In a platen press the combination of mechanism for locking the platen in a pre determined position, means on said platen for unlocking said mechanism to throw off the impression of the platen, paper removing means and a trip lever, pivoted on the frame of the press and at all times disconnected from said unlocking means, automatically operable to actuate said unlocking means when the said paper removing means fail to remove a sheet from the press.

4. In a platen press the combination of mechanism for locking the platen in a pre determined position, a device for unlocking and locking said mechanism to throw oil or to throw on the platen impression, an electrically operated trip arm pivoted on the press for actuating said device to throw-off the impression, a throw-on arm on the platen for actuating said device to throw the impression on and a manually operated abut-- ment for operating said throw-on arm.

5. In a platen press the combination of mechanism for locking the platen in a predetermined position, means ior unlocking said mechanism, an electrically controlled device for actuating said unlocking means, an electrical circuit for operating said platen press and means in said circuit for automatically causing said device to operate under certain predetermined conditions of operation of said press.

6. The combination of a platen press, means for adjusting the position of the platen therein, means for operating said adjusting means to throw off the impression of the platen, an electrically controlled member for actuating said operating means, an electrical circuit for operating said press and including the said member and means in said circuit for automatically causing said member to act and to stop the sai press.

7. In combination, a platen press, means for adjusting the impression of the platen, mechanism for throwing the impression. on and off, a tripping lever, means for manually operating said tripping lever to actuate the said mechanism, an electrical press operating circuit, means in said circuit tor automatically causing said tripping lever to actuate said mechanism to throw oil the impression and means in said circuit for automatically breakin the same to stop the press when the impression has been thrown off.

CARL F. FRAUENBERGER. 

